code: def __init__(
      self,
      prior_box_var=[0.1, 0.1, 0.2, 0.2],
      code_type="decode_center_size",
      box_normalized=False,
      axis=1,
  ):
      super(BoxCoder, self).__init__()
      self.prior_box_var = prior_box_var
      self.code_type = code_type
      self.box_normalized = box_normalized
      self.axis = axis
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from collections import OrderedDict
  from paddle import fluid
  from paddle.fluid.param_attr import ParamAttr
  from paddle.fluid.initializer import Normal, Xavier
  from paddle.fluid.regularizer import L2Decay
  from paddle.fluid.initializer import MSRA
label_desc: Use image node_id 1 to create a new BoxCoder object from inherited base classes: object with example: obj = BoxCoder(prior_box_var, code_type, box_normalized, axis)